A huge amount of waste oyster shells are being produced in the southern coast of South Korea. In order to find the possibility to recycle the waste as construction materials, mechanical characteristics of oyster-shell such as compressive strength and modulus of elasticity, were investigated. Compressive strength tests for mortar specimen with varying blending ratio of cement, water, fine aggregate, and oyster-shell were compared with normal cement mortar. There was continuous decreasing tendency in compressive strength as increasing dosages of oyster-shell when used as a replacement of cement, however strength and stiffness were increased around 10% of dosages of oyster-shell when used as a replacement of fine aggregate. The experiment results demonstrate that oyster-shells can be recycled and effective in replacement of not only cement but also fine aggregates.

1. 서 론
 2. 실험방법
  2.1 실험계획
  2.2. 실험 방법
 3. 실험결과 및 고찰
  3.1 배합순서에 따른 영향
  3.2 시멘트 대체제와 잔골재 대체제
  3.3 굴패각의 모르타르의 탄성계수
 4. 결 론
 REFERENCES

• 노영숙(서울과학기술대학교 건축공학과 교수) | Roh Young-Sook Corresponding author
• 권성호(서울과학기술대학교 기계자동차공학과 학부생) | Kwon Seong-Ho
• 김태경(서울과학기술대학교 건축공학과 학부생) | Kim Tae-Gyung
• 이용국(서울과학기술대학교 건축공학과 학부생) | Lee Yong-Guk